Malicious PDF — malware analysis report

Static analysis result for SHA-256 531b88946dcdf8de…

MALICIOUS

PDF

80.2 KB Created: 2021-03-29 14:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b9f024aac33a50aeae7e4fd6a6b0112c SHA-1: 5ad3e771951c359ba1195926f0415586215198c2 SHA-256: 531b88946dcdf8de80ffe75d45174099f2a35ff457bdefa14837c8bdb197041a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/award?keyword=chicken+chaap+recipe+in+bengali+pdf PDF link annotation
    • http://pl50off.info/juripiwitipotevalujizakusd4.pdfIn PDF document text
    • https://cdn.sqhk.co/wupetutigo/gjdibhi/bollywood_new_movie_hd_free.pdfIn PDF document text
    • http://doordash.link/gigabyte_z370_aorus_ultra_gaming_motc69m1.pdfIn PDF document text
    • http://eslife.pro/beechcraft_bonanza_f33a_maintenance_manualfmolq.pdfIn PDF document text
    • http://xumupizaxuto.scienceontheweb.net/pretty_little_liars_cast_season_1_episode_21.pdfIn PDF document text
    • http://funseeds.site/92744831748rmbi4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475215/normal_5fe4b4c21b66a.pdfIn PDF document text
    • http://eslife.pro/acer_laptop_power_cord_replacementwyymh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475987/normal_5fce3652b0797.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427295/normal_5fe336ce8e496.pdfIn PDF document text
    • http://lnstagram-verificationbadgeform.com/linda_goodman_s_sun_signswmdfm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413735/normal_5ff64e5a0497f.pdfIn PDF document text
    • https://cdn.sqhk.co/pobijejok/hieEmhe/crossword_solver_game_show_hosts.pdfIn PDF document text
    • https://cdn.sqhk.co/boxepupovemu/hihg1d2/jewels_switch_apk_mod_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455658/normal_60609377c7c37.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/vikegelivusip.pdfIn PDF document text
    • http://ita-talia.fun/31100088072maww2.pdfIn PDF document text
    • http://goxamid.mypressonline.com/nyc_ballet_workout.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/dba391f6-6aec-45da-a494-041136e97486/how_to_use_a_innova_3020b_code_reader.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd4e14a9-4c59-4b2e-9d5b-71f1a04003e6/52552792631.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15a9b7a-ee6e-4b81-99a5-a0ffb5a22414/masimo_rad_8_pulse_oximeter_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9260bbc-36f6-40eb-b81e-68e514834b3d/senufomewokate.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 5064 bytes
SHA-256: e67418013c78af9dbf7359cd941c3d1fcdc9b0af18466e635441db3afbc3da85
font_01_sfnt_off00010143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10143 10508 bytes
SHA-256: 92d78601e6f89f90f6e55525f83a70baa7d3e2fdf9fef2cde0ed8cb5c076b061
font_02_sfnt_off00012512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12512 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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